(NCN WeatherCenter) — Have you noticed that we have been wearing t-shirts a lot this month? It is the fourth warmest December (to date) on record at Raleigh-Durham International Airport. The record high for Goldsboro is 78 degrees.

Interestingly enough, December (average temperature: 50.4) has actually been warmer than November (average temperature: 48.9) this year.

Where is winter? It’s been one of the warmest Decembers on record.

So far, there have been nine days in December with highs of at least 70 degrees at RDU. The average is only 2-3 and the record was 11 in 2015.

With more record warmth in the forecast this week, we are likely to break this record.

It’s easy to see the significant December warmth when you plot the high temperatures on a calendar.

Why so warm? La Nina’s typically lead to above-normal temperatures in the winter across the southeast US but climate change is also likely to blame.

Since the 1970s, winter is the fastest warming season in the United States.

Here in North Carolina we can see the local impacts as well.

Since the 1970s, RDU sees an average of 14 more days with above normal temperatures during meteorological winter.